The backup vocals in modern Rap and Hip Hop. Mostly found in the Crunk/Dirty South subgenre, these vocal parts usually consist of short vocal stabs that may be short words or abstract sounds like "Yea", "What", "Hey", or simply "Ugh" or "UH"

Usher Raymond: I have this newsong but something is missing...
Producer: Call up Lil Jon, we'll get him in here to lay down some brotha tones.